class_docstr: Power variance function:
  
  V(mu) = fabs(mu)**power
  
  INPUTS:
     power -- exponent used in power variance function
code: def __init__(self, power=1.0):
      self.power = power
  
file_path: nipy/nipy/algorithms/statistics/models/family/varfuncs.py
imports: import numpy
label_desc: Use image node_id 1 to create a new Power object  with example: obj = Power(power)